EP0258454B1 - Procede et dispositif pour couper et souder des courroies d'acier - Google Patents

Procede et dispositif pour couper et souder des courroies d'acier Download PDF

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Publication number
EP0258454B1
EP0258454B1 EP87901655A EP87901655A EP0258454B1 EP 0258454 B1 EP0258454 B1 EP 0258454B1 EP 87901655 A EP87901655 A EP 87901655A EP 87901655 A EP87901655 A EP 87901655A EP 0258454 B1 EP0258454 B1 EP 0258454B1
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EP
European Patent Office
Prior art keywords
steel strip
line
welding
cutting
succeeding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP87901655A
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German (de)
English (en)
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EP0258454A1 (fr
EP0258454A4 (fr
Inventor
Mamoru Fujii
Kazuo Noda
Shoji Nagasaka
Hiroshi Tajika
Koji Ono
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JFE Steel Corp
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Kawasaki Steel Corp
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Filing date
Publication date
Priority claimed from JP61054406A external-priority patent/JPS62212086A/ja
Priority claimed from JP61311111A external-priority patent/JPS63165087A/ja
Priority claimed from JP62029177A external-priority patent/JPS62275591A/ja
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0258454A1 publication Critical patent/EP0258454A1/fr
Publication of EP0258454A4 publication Critical patent/EP0258454A4/fr
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Publication of EP0258454B1 publication Critical patent/EP0258454B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
    • B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
    • B26D5/32—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier with the record carrier formed by the work itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0408—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work for planar work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B23K2103/05—Stainless steel

Definitions

  • This invention relates to a method and an apparatus for cutting and welding steel strips in accordance with the precharacterizing parts of the claims 1, 5 and 6, respectively.
  • processing in order to perform rolling and other processing of steel strips (hereinafter referred to as processing) in a steel strip processing line, consecutively and continuously supplied steel strips are joined together by arc welding together the facing ends of the steel strips. Also, such processings as rewinding welding, slitting and cutting (hereinafter referred to as conditioning) are performed on silicon steel strips, for instance, before the steel strips are supplied as product to the customer. Among these processings, to supply a unit weight as required by the customer, steel strips are joined together by butt welding to obtain a continuous steel strip before cutting to meet said unit weight for the purpose of supplying the steel strips in the form of coils or sheets to the customer.
  • the trailing end of a preceding steel strips and the leading end of a succeeding steel strips are cut in a continuous processing line of a commonly termed shear welder, and the cut end surfaces of the two, i.e., preceding and succeeding, steel strips are caused to abut and then arc welded by the TIG, MIG or like arc welding.
  • a continuous processing line called shear welder consecutive steel strips are caused to run from the upstream side to the downstream side and a cutting unit and a welding unit for cutting and welding ends of steel strips are respectively provided along the flow of steel strips.
  • Each end of the steel strip is cut by an upstream side shearing unit, and in a downstream side welding unit the cut ends of consescutive steel strips are abutted and welded usually by the TIG or MIG arc welding.
  • the continuous steel strip may be wound into the form of a coil without removing the weld. By so doing, no substantial flaw is generated.
  • the laser welding process permits sufficient effects and great advantages to be obtained when it is used for the welding in the conditioning process of silicon steel strips. That is, the weld obtained by the laser welding has a very small weld bead width and is substantially free from thermal influence. This means that the joint steel strip may be stamped by the customers, without applying any treatment to the weld bead by themselves.
  • silicon steel strips are usually stamped in a high speed continuous stamping line. Therefore, very long steel strips are desired for increasing the stamping efficiency.
  • the laser welding permits welding of cold-rolled steel strips and stainless steel strips as well as silicon steel strips, which are very thin, typically about 0.05 mm, and until now could not be welded by the prior art TIG or MIG welding.
  • the use of the laser welding requires high accuracy of the cutting and butting operations before the welding process.
  • there have been developed techniques of accurately cutting ends of steel strips and causing accurate abutting of the cut ends for welding is disclosed in Japanese Utility Model Laid-Open 57-102495.
  • the cut ends of steel strips should be straight and accurately perpendicular to the center line of the steel strips. Then, the cut end surfaces should be caused to about that the edges of the abutted steel strips are aligned with respect to a straight line.
  • the Japanese Utility Model Laid-Open 57-102495 disclose a device for securing one edge of a steel strip such that it is parallel to the center line of the steel strip.
  • a side guide is secured to one side of a work table at a cutting or welding position of a continuous steel strip processing line.
  • One edge of steel strip is aligned by urging it against the side guide, and in this state the cutting or abutting prior to welding is done.
  • the device noted above further features that when urging one edge of the steel strip a press belt is urged against the surface of he steel strip, and it is driven to pull the steel strip toward the side guide on the work table so as to bring one edge of the steel strip into contact with the side guide, thus effecting the positioning of the steel strip.
  • this aligning device moves the steel strip with the press belt in contact with the surface of the steel strip, press flaws are liable to be formed on the surface of the steel strip, particularly the surface of a very thin steel strip, by the urging force of the press belt and movement thereof in the width direction of the work table. Further, when the steel strip is very thin, it is liable to be in close contact with the work table on the continuous processing line such as a shear welder. Therefore, it is difficult to move the steel strip in the width direction even if its surface is urged by the press belt. Therefore even if this aligning device is used, it is difficult to obtain a weldment free from any edge alignment departure.
  • JP-A-57-31489 discloses a method and apparatus for joining of steel plates by laser. Before welding, cutting of the plates is performed by a laser beam.
  • An essential feature of the invention resides in that when causing the abutting of the two cut end surfaces of steel strips prior to welding the end surfaces with a welding torch in the width direction of the steel strips in the continuous processing line, the facing end of one of the steel strips is attracted and held by an electromagnetic chuck upstream or downstream the torch running line, on which side the torch running line is not contained, the facing end of the other steel strip is raised so that the cut end surface is directed obliquely and downwardly toward the cut end surface of the other steel strip, and in this state the abutting surfaces of the two steel strips are caused to abut.
  • the preceding steel strip with the cut trailing end surface can be held and magnetized by the electromagnetic chuck provided on the side, which is free from the torch running line, with the cut end surface as the abutting surface in register with the center line of the continuous processing line. Then, the succeeding steel strip with the cut leading end is raised by suitable means, e.g., a roller, to direct the cut end surface at the leading end obliquely downwardly toward the end surface of the preceding steel strip.
  • suitable means e.g., a roller
  • alignment can be effected by optically enlarging the opposite ends of the butt line with the optical enlargement devices. Particularly, when the optical image is processed with an image sensor, the alignment can be done automatically.
  • reference numeral 1 designates a preceding steel strip, and numeral 2 a succeeding steel strip. These steel strips 1 and 2 are consecutively fed by a pair of pinch rollers 3 and 4 to a cutter/welder which constitutes part of a continuous processing line.
  • the cutter/welder includes a cutting unit 5 and a welding laser torch 6 provided in the mentioned order from the upstream side.
  • Aligning units 7 to 9, as shown by dashed lines in Fig. 1, are provided before, between and after the cutting unit 5 and welding torch 6 in the direction of feeding of steel strips. Detailed construction of the aligning units 7 to 9 is shown in Fig. 5.
  • the trailing end of the preceding steel strip 1 fed first by the upstream side pinch rollers 3 and 4 is aligned by the aligning unit 8 such that one end of it is parallel to the center line of the continuous processing line (see Fig. 5).
  • the trailing end of the preceding steel strip 1 is cut by the cutting unit 5.
  • the preceding steel strip 1 is further fed by a feeding clamp 10 to the downstream side to be stopped when its cut end 1a comes to a position beneath the welding torch 6. Beneath the welding torch 6, one edge of the preceding steel strip 1 is aligned by the aligning unit 9 to make it parallel to the center line C-C of the continuous processing line (see Fig. 5).
  • the cut end surface 1a of the preceding steel strip 1 is brought into register with a line 6a, along which the welding torch 6 is moved (see Fig. 5), by causing movement of a work table 13 beneath the welding torch 6 in the direction of feed in the continuous processing line and also revolution of the work table 13 about a revolving section 21 (see Fig. 2).
  • the succeeding steel strip 2 is fed by the pair of pinch rollers 3 and 4.
  • the leading end of the succeeding steel strip 2 is aligned by the aligning unit 7 such that one edge is parallel to the center line C-C of the continuous processing line. In this state, it is cut by the cutting unit 5.
  • the succeeding steel strip 2 is further fed by the pair of pinch rollers 3 and 4 to the downstream side, and beneath the welding torch 6 the leading end of the succeeding steel strip 2 is aligned by the aligning unit 8 such that one edge is parallel to the center line 6 of the continuous processing line.
  • the cut end surface 2a of the leading end of the succeeding steel strip 2 is directed downwards for abutting with the cut end surface 1a of the preceding steel strip 1 having been positioned to be in register with the torch running line 6a. In this state, the abutted end surfaces are welded together by driving the welding torch 6.
  • a plurality of work tables 11 to 14 are arranged along a straight line constituting a feed path, along which the preceding and succeeding steel strips 1 and 2 are fed.
  • the work table 13 which is disposed underneath the welding torch 6 is capable of being moved in the direction of the continuous processing line, i.e., feed path, and also revolved about the revolving section 21 (see Fig. 2).
  • the cut end surface 1a of the preceding steel strip 1 can be finally adjusted such that it is accurately in register with the torch running line 6a (which is positioned to be stringently perpendicular to the center line C-C in the continuous processing line).
  • the upstream side cutting unit 5 is usually provided as a shearing unit with a shear or the like or a fusion severing unit for effecting fusion severing with a laser beam or a cutting unit for effecting cutting with a grindstone.
  • the welding torch (hereinafter referred to as torch) 6 is provided downstream the cutting unit 5.
  • the torch running line 6a is positioned such that it extends in a direction stringently perpendicular to the center line C-C of the continuous processing line (see Fig. 5), i.e., the direction of running of the preceding and succeeding steel strips 1 and 2, and then the torch 6 is provided such that it can run along the torch running line 6a.
  • the movable table 13 which is provided underneath the torch 6 is constructed such that it can undergo parallel movement in the direction of running of the preceding and succeeding steel strips 1 and 2, i.e., along the center line C-C of the continuous processing line. Also, it is provided on a revolving table 20 to be noted above such that it can be revolved about the revolving section 21 (see Fig. 2).
  • the torch 6 is constructed such that it is vertically movable and can also run in stringent register with the torch running line 6a positioned to be perpendicular to the direction of running of the preceding and succeeding steel strips 1 and 2.
  • securement clamps 16 and 17 are provided such that they are vertically movable.
  • a back bar 15 is provided in register with the torch running line 6a (see Fig. 5). Downstream and upstream side electromagnetic chucks 18 and 19 are provided on the opposite sides of the back bar 15.
  • the trailing end of the preceding steel strip 2 are held independently from above the securement clamps 16 and 17.
  • the trailing end of the preceding steel strip 1 and leading end of the succeeding steel strip 2 are held by magnetization by the downstream and upstream side electromagnetic chucks 18 and 19.
  • the mechanism for causing the parallel movement and revolution may have any desired construction.
  • the revolving table 20 is constructed as follows such that it is capable of revolution about the revolving section 21 and the movable table 13 can undergo parallel movement along the revolving table 20.
  • the revolving table 20 is disposed on a stationary table 37 and is capable of revolution about the intersection between one reference side surface 13a of the movable table 13 and the torch running line 6a (see Fig. 5), e.g., about the revolving section 21 provided between the revolving and stationary tables 20 and 37, as shown in Fig. 2.
  • a moving mechanism and a butt state detection mechanism are constructed as follows.
  • the movable table 13 is strided by a gate-shaped frame 22 provided on a base 26.
  • a top beam 22a of the gate-shaped frame 22 is provided with upper and lower tracks, e.g., rails 23a and 23b, extending in its longitudinal direction.
  • the torch 6 is provided such that it can run along these rails 23a and 23b.
  • a laser beam is supplied from a laser 25 to the torch 6, and it is converged to a diameter of about 0.1 mm to effect laser beam welding of the steel strips 1 and 2.
  • a laser beam path 24 is provided extensively along the top beam 22a of the frame 22.
  • the torch 6 is coupled to the front end of the laser beam path 24, and the laser beam 25 is coupled to the rear end of the laser beam path.
  • the laser beam emitted from the laser 25 is led through the laser beam path 24 to the torch 6.
  • the laser beam path 6a is extended or contracted, whereby the two steel strips 1 and 2 are welded by laser beam welding.
  • a mechanism for raising and lowering the downstream and upstream side securement clamps 16 and 17 may have any structure.
  • the mechanism is constructed as a piston-cylinder mechanism. Besides, it is constructed that it operates in an interlocked relation to the movable table 13, revolving table 20 and stationary table 37.
  • the two securement clamps 16 and 17 are constructed to be identical, and the raising and lowering mechanism is provided independently on each securement clamp.
  • Fig. 2 shows a typical construction of the mechanism for raising and lowering the upstream side securement clamp 16.
  • the mechanism consists of a pair of support pillars 27 provided inside the gate-shaped frame 22, cylinders 28 mounted on the respective support pillars 27 and rods 29 driven by the operating fluid of the cylinders 28.
  • the upstram side securement clamp 16 is mounted on top of the rods 29, and it is raised and lowered with the elongation and contraction of the rods 29.
  • the mechanism for raising and lowering the downstream side securement clamp which is not shown, has the same construction.
  • the revolving table 20 is provided on the inner side of the pair of support pillars 27 constituting part of the raising/lowering mechanism.
  • Translational bearings 31 are provided on the top of the revolving table 20 and the bottom of the movable table 13, and bearing rails 30 are interposed between the upper and lower bearings 31.
  • a parallel movement unit for causing a parallel movement of the movable table 13, as shown in Fig. 1, consists of a numerical control motor 32 provided on the revolving table 20 and a ball screw 33 coupled to the numerical control motor 32. The end of the ball screw 33 is coupled to the movable table 13.
  • the numerical control motor 32 can be correspondingly driven to a slight extent to obtain accurate abutting of the two cut end surfaces 1a and 2a.
  • the revolving table 20 is caused to undergo revolution about the revolving section 21, which is located at the intersection between the reference side edge 13a of the movable table 13 (see Fig. 2), i.e., the edge parallel to the center line of the continuous processing line, and the torch running line.
  • the revolving mechanism i.e., the revolving section 21 at the intersection, may consist of a cylindrical bearing 34, a ball screw 35 and a numerical control motor 36. More specifically, as shown in Fig. 2, the cylindrical bearing 34 is provided between the revolving table 20 and stationary table 37, the ball screw 35 is aligned to the cylindrical bearing 34, and the numerical control motor 36 is coupled to the ball screw 35.
  • the numerical control motor 36 can be controlled to carry out a corresponding rotation. Further, as will be described later, it is necessary to obtain perfect register of the abutting line with the torch running line 6a (see Fig. 5) after the butt surfaces 1a and 2a of the preceding and succeeding steel strips 1 and 2 (see Fig. 5) have been abutted on the movable table 13. This is done by causing parallel movement and revolution of the movable table 13.
  • At least two optical enlargement units 37 and 38 are provided for optically enlarging the two ends of the butt line. These two optical enlargement units 37 and 38, like the torch 6, are adapted to run in a direction perpendicular to the center line C-C of the continuous processing line (see Fig. 5).
  • the optical enlargement units 37 and 38 have the same construction and respectively consist of microscopes 37a and 38a, cameras 37b and 38b and movable saddles 37c and 38c.
  • the saddles 37c and 38c are engaged with the rails 23a and 23b of the torch 6, as shown in Fig. 2. It is possible to drive the movable saddles 37c and 38c independently instead of causing their movement along the same rails 23a and 23b as for torch 6.
  • the movable clamp 10 for causing the preceding steel strip 1 to the downstream side after the cutting of the trailing end, as shown in Figs.
  • the upper clamp piece 10a can be raised and lowered by vertical movement cylinders 39 provided on the opposite sides of the lower clamp piece 10b.
  • the lower clamp piece 10b has a comb-shaped top portion, which is assembled to the work table 14 which has a handle-like shape.
  • the comb-shaped top portion of the lower clamp piece 10b slightly projects upwards from the work table 14. The preceding steel strip 1 thus can be smoothly clamped between the upper and lower clamps 10a and 10b without obstruction of its movement.
  • a mechanism for moving the movable clamp 10 consists of a numerical control motor 40, a ball screw 41 and a pair of bearings 41a and a bearing rail 42. Therefore, even if the extent of movement of the movable clamp 10 is very slight, e.g., of the order of microns, the rotation of the motor 40 can be controlled correspondingly, and the movable clamp 10 can be moved accurately.
  • the cutting unit 5 or cutting the facing ends of the preceding and succeeding steel strips 1 and 2 usually consists of a pair of, i.e., upper and lower, blades 5a and 5b, as shown in Fig. 1, and it can cut the ends by shearing. It is also possible to construct the cutting unit 5 such that it fusion separates the end with a laser beam, an electron beam or other heat sources instead of shearing the end.
  • a scrap removal unit 43 may be provided, if necessary, to remove scrap produced as a result of the cutting operation from the work table 12.
  • the aligning units 7 to 9 consist of respective electromagnetic chucks 7a, 8a and 9a and reference blocks 7b, 8b and 9b.
  • the electromagnetic chucks 7a, 8a and 9a and reference blocks 7b, 8b and 9b can be moved by extension/contraction devices 7c, 8c, and 9c in a direction perpendicular to the center line C-C of the continuous processing line.
  • the aligning unit 8 is used as noted above.
  • the opposite side reference blocks 8b provided outside of the continuous processing line are moved by the respective extension/contraction devices 8c to a reference position, at which they are parallel to the center line C-C of the continuous processing line.
  • the preceding steel strip 1 is fed by the upper and lower pinch rollers 3 and 4, as shown in Fig. 1, and it is stopped while its trailing end is on the upstream side of the cutting unit 5 (only the upper blade 5a thereof being shown in Fig. 5).
  • the central electromagnetic chuck 8a is partly assembled in the work table 11. When the electromagnetic chuck 8a is excited at this time, the underside of the preceding steel strip 1 is attracted to the chuck 8a.
  • the electromagnitic chuck 8a is pulled by the extension/contraction device 8c in a direction away from the continuous processing line in Fig. 5.
  • the side edge 1b of the preceding steel strip 1 is thus pulled toward and brought into contact with the reference blocks 8b, so that it is aligned thereto.
  • the side edge 1b of the preceding steel strip 1 is parallel to the center line C-C of the continuous processing line.
  • the trailing end of the preceding steel strip 1 is cut to obtain the cut end surface as the abutting surface perpendicular to the center line C-C.
  • one side edge 2b of it is aligned by the aligning unit 7 so that it is parallel to the center line C-C. Again at this time, the leading end is cut in the same manner as for the preceding steel strip 1 to obtain the cut end surface 2a perpendicular to the center line C-C at the leading end of the succeeding steel strip 2. Further, when the cut end surfaces 1a and 2a of the steel strips 1 and 2 are abutted on the movable table 13, the side edges 1b and 2b are rendered parallel to the center line C-C. At this time, the preceding and succeeding steel strips 1 and 2 are aligned by the respective aligning units 9 and 8.
  • the steel strips 1 and 2 are moved in a direction perpendicular to the center line C-C with their under side attracted to the electromagnetic chucks 7a, 8a and 9a by electromagnetic forces, and thereby the side edges 1b and 2b of the steel strips 1 and 2 are brought into contact with the reference blocks 7b, 8b and 9b provided on the opposite sides of the electromagnetic chucks 7a, 8a and 9a. If the magnetic forces of the electromagnetic chucks 7a, 8a and 9a are excessive at this time, the side edges 1b and 2b of the steel strips 1 and 2 are liable to be stressed by the pulling force. In this case, the side edges 1b and 2b can not be accurately aligned.
  • the steel strips 1 and 2 can not be moved against the frictional resistance. Further, the pulling force based on the magnetic forces of the electromagnetic chucks 7a, 8a and 9a are varied according to the thickness of the steel strips. That is, with the same current supplied to the electromagnetic chucks 7a, 8a and 9a, the pulling force that is produced is large if the thickness is large, while it is small if the thickness is small. Meanwhile, it is difficult to strain the side edges 1b and 2b of the steel strips 1 and 2 when their thickness is large, while they are easily strained when their thickness is small.
  • the proper pulling force should be adjusted to be in a range greater than the pulling force, with which the steel strips 1 and 2 are moved to bring the side edges 1b and 2b into contact with the reference blocks 7b, 8b and 9b, but less than the pulling force, with which the edges 1b and 2b are stressed in contact with the reference blocks 7b, 8b and 9b. Therefore, when pulling the steel strips 1 and 2 with the electromagnetic chucks 7a, 8a and 9a, the magnetic forces of the electromagnetic chucks 7a, 8a and 9a are suitably adjusted through current adjustment as soon as one of the side edges 1b and 2b is brought into contact with some of the reference blocks 7b, 8b and 9b.
  • the steel strips 1 and 2 are aligned with respect to the electromagnetic chucks 7a, 8a and 9a.
  • the pulling force is held in an adequate range at the time of the contact, so that the side edges 1b and 2b of the steel strips 1 and 2 can be aligned without generation of any strain.
  • the pulling force can be increased so that the steel strips 1 and 2 can be moved irrespective of their weight and thickness.
  • the succeeding steel strip 2 experiences a rotational moment about the reference block 7b in contact with it due to the pulling force of the electromagnetic chuck 7a.
  • the side edge 2b of the succeeding steel strip 2 becomes parallel with the center line C-C.
  • a strong pulling force is subsequently exerted to the succeeding steel strip 2, a strain is liable to be generated in the side edge 2b.
  • the cut end surface 1a and 2a are welded by butt welding on the movable table 13 under the torch 6.
  • a roller 44 is provided upstream the movable table 13 such that it can be raised and lowered by a vertical movement cylinder 45. With the provision of the roller 44 in this way, it cooperates with the pair electromagnetic chucks 18 and 19 on the movable table 13 to cause the abutting surface 1a of the preceding steel strip 1 to abut with the abutting surface 2a of the succeeding steel strip 2 without gap formed between the two surfaces.
  • the strip 1 is brought to the welding position, i.e., the movable table 13 as shown in Fig. 6(b).
  • the cut end surface 1a of the trailing end of the preceding steel strip 1 is brought into register with the torch running line 6a, and the preceding steel strip 1 is secured at this position by raising the securement clamp piece 17 by exciting the electromagnetic chuck 19, as shown in Fig. 6(b).
  • the succeeding steel strip 2 is fed by the pair of pinch rollers 3 and 4 up to the cutting position as shown in Fig. 6(b).
  • the leading end of the succeeding steel strip 2 is cut by the upper and lower blades 5a and 5b with the edge aligned (see Fig. 6(b)), and then the scrap is removed by the scrap removal unit 43 (see Fig. 6(c)).
  • the succeeding steel strip 2 is fed to the downsteam side by the pair pinch rollers 3 and 4.
  • the roller 44 is raised when it is passed by the leading end of the succeeding steel strip 2.
  • the roller 44 is provided at a position about 40 cm upstream the torch 6 and is adapted to be raised up to a level corresponding to the thickness of the steel strips. For example, when the thickness is about 0.20 mm, the level is adjusted to about 1 cm.
  • the succeeding steel strip 2 is very thin, e.g., 0.35 mm or less in thickness, by raising the roller 44 the abutting surface 2a of the leading end is directed obliquely downwards (see Fig. 6(d)).
  • the succeeding steel strip 2 is fed by the pair of pinch rollers 3 and 4 such that the abutting surface 2a at the leading end is not raised above and slides along the movable table 13.
  • the abutting surface 2a of the succeeding steel strip 2 sliding over the movable table 13 approaches the abutting surface 1a of the trailing end of the preceding steel strip 1 as shown in Fig. 6(d).
  • the abutting surface 2a is attracted by the abutting surface 1a, and perfect close contact between the two abutting surfaces 1a and 2a can be obtained. More specifically, since the abutting surface 1a of the trailing end of the preceding steel strip 1 has been magnetized by the electromagnetic chuck 19, the approaching abutting surface 2a of the leading end of the succeeding steel strip 2 is strongly attracted in a downwardly directed state, so that it is possible to obtain abutting without substantial gap formed between the two abutting surfaces.
  • the roller 44 is lowered. Then, the lower surface of the steel strips is attracted by the other electromagnetic chuck 18, and the upper surface is clamped by the securement clamp 16 (see Fig. 6(e)). Thereafter, the torch running line 6a and abutting line are brought into register by causing parallel movement and revolution of the movable table 13 with two enlargement units 38. In this state, the abutting surfaces are welded together by driving the torch 6.
  • the torch 6 is constructed as a laser beam welding torch for cutting and welding steel strips with a thickness of about 0.1 mm, there is no need of providing the cutting unit 5 consisting of the upper and lower blades 5a and 5b upstream the torch 6.
  • a cutter/welder as part of a continuous processing line as shown in Figs. 7 and 8.
  • the facing ends of the two steel strips 1 and 2 are cut and fusion separated by the torch 6, and then the cut end surfaces 1a and 2a of the two steel strips 1 and 2 are caused to abut each other and then welded.
  • the cutting by the fusion separation and butt welding are done by the torch 6. Therefore, while the construction shown in Fig.
  • FIG. 7 has three aligning units 7, 8 and 9, the construction shown in Fig. 7 has only two aligning units 8 and 9. Also, the movable table 13 shown in Fig. 7 is provided with a fusion separation groove 46 in addition to the back bar 15. For the rest, the construction is the same as that shown in Fig. 1.
  • the preceding steel strip 1 which has been fed by the pair of, i.e., upper and lower, pinch rollers provided on the upstream side and movable clamp 10 provided on the downstream side, is fed up to the movable table 13 underneath the torch 6.
  • This movable table 13 like the movable table shown in Figs. 1 and 2, is capable of parallel movement in a direction of the center line C-C in the continuous processing line (see Fig. 8) and revolution by the revolving table 20 about the revolving section 21.
  • the edge 1b of the preceding steel strip 1 see Fig.
  • the torch 6 effects cutting of the facing ends of the two steel strips 1 by fusion separation and butt welding of the cut surfaces 1a and 2a.
  • the movable table 13 has the fusion separation groove 46 and back bar 15 provided in the mentioned order from the upstream side, and like the arrangement of Fig. 1 electromagnetic chucks 18 and 19 are provided on the opposite sides of the back bar 15.
  • the method and apparatus for cutting and welding steel strips according to the invention are very effective when joining together facing ends of preceding and succeeding steel strips for permitting a continuous rolling or other processing or when joining together silicon steel strips or the like by welding before supplying them as product to the customer, particularly by a unit weight as required by the customer.
  • the latter are joined together with high accuracy by aligning the center line of the steel strips in parallel to the center line of the processing line.
  • the invention is very effective for the joining of silicon steel strips by welding.

Abstract

Un procédé, servant à couper et à souder des courroies d'acier, consiste à couper à l'aide d'un appareil prévu à cet effet les courroies d'acier antérieure et postérieure acheminées en continu au niveau de leurs extrémités opposées, puis à les souder bout à bout, leurs sections formées par l'opération de coupe faisant office de surfaces à joindre. Selon ledit procédé, lesdites courroies sont coupées et jointes en vue du soudage, de façon à disposer l'un de leurs bords latéraux au niveau de leur extrémité parallèlement à la ligne médiane d'une chaîne de traitement continu, dans laquelle la coupe et le soudage sont effectués selon le procédé décrit. Lors de la mise en place dudit bord latéral, la courroie d'acier antérieure ou postérieure est en outre attirée au moyen d'un mandrin électromagnétique sur la table de travail de la chaîne de traitement continu, ce qui permet l'étirement de la courroie d'acier antérieure ou postérieure en direction du côté d'un bloc de référence disposé parallèlement à ladite ligne médiane, de telle sorte que l'un des bords latéraux de la courroie d'acier antérieure ou postérieure est placée en about contre le bloc de référence. Lors de la mise en contact face à face desdites sections avant le soudage, la courroie d'acier antérieure est attirée et maintenue par le mandrin électromagnétique sur la table de travail, la disposition de l'un de ses bords latéraux étant la même que celle décrite ci-dessus, tandis qu'une partie de l'extrémité de la courroie d'acier postérieure est relevée de façon à former une boucle, ce qui permet à sa section formée par l'opération de coupe d'être inclinée vers le bas par rapport à la section de la courroie d'acier antérieure, de telle sorte que les deux extrémités entrent en contact l'une avec l'autre.

Claims (7)

  1. Procédé de découpage, de mise bout-à-bout et de soudage d'extrémités (1a et 2a), se faisant face, de bandes en acier (1 et 2), avancées, de manière successive, le long d'une ligne de traitement de bande d'acier, au moyen d'un faisceau laser, ledit procédé comprenant les étapes de découpage desdites extrémités (1a et 2a) opposées de bandes d'acier précédente et suivante (1 et 2), de mise bout-à-bout, des extrémités découpées (1a et 2a) correspondantes, de manière à former une ligne de bout-à-bout et soudage au moyen du faisceau laser, suivant ladite ligne de bout-à-bout, pour obtenir une liaison bout-à-bout desdites extrémités opposées (1a et 2a),
       caractérisé en ce que ladite étape de mise bout-à-bout comprend, en outre, les étapes d':
    - aimantation d'une extrémité arrière (1a) de la bande d'acier précédente (1), de manière à y produire une force magnétique et maintien simultanément de ladite extrémité arrière (1a) de ladite bande d'acier précédente (1) de façon qu'une bordure latérale (1b) de ladite bande précédente (1) soit alignée pour être parallèle à une ligne centrale (C-C) de ladite ligne de traitement de bande d'acier et de façon que ladite extrémité arrière (1a) de ladite bande précédente (1) coïncide avec une trajectoire de déplacement (6a) d'un chalumeau de soudage au laser (6), lui permettant de s'étendre dans une direction perpendiculaire audit axe (C-C), en utilisant un mandrin électromagnétique (19) contigu à ladite trajectoire de déplacement (6a),
    - rotation d'une extrémité avant (2a) de la bande d'acier (2) immédiatement suivante, dans une direction orientée vers le bas et oblique par rapport à ladite extrémité arrière (1a) de ladite bande d'acier précédente (1), au cours de l'approche de ladite extrémité avant (2a) vers ladite extrémité arrière (1a) et
    - attraction de ladite extrémité avant (2a) par ladite extrémité arrière (1a), en utilisant ladite force magnétique produite par ladite extrémité arrière (1a), jusqu'à ce que ladite extrémité arrière (1a) soit en contact avec ladite extrémité avant (2a).
  2. Procédé selon la revendication 1, caractérisé en ce que ledit alignement latérale de la bordure latérale (1b ou 2b) de ladite bande d'acier précédente (1) ou de ladite bande d'acier suivante (2), parallèlement audit axe (C-C), est réalisé par un procédé comprenant les étapes d':
    - attraction d'une surface inverse de ladite bande d'acier précédente (1) ou bien de ladite bande d'acier suivante (2), au moyen d'un mandrin électromagnétique (7a, 8a ou 9a) pouvant se déplacer le long d'une ligne transversale, de manière sensiblement perpendiculaire audit axe (C-C), avant ladite étape de découpage ou de mise bout-à-bout desdites extrémités (1a et 2a) se faisant face desdites bandes d'acier précédente et suivante (1 et 2),
    - déplacement dudit mandrin électromagnétique (7a, 8a ou 9a) le long de ladite ligne transversale et tirage simultanément de ladite bande d'acier précédente ou suivante (1 ou 2), jusqu'à ce que sa bordure latérale (1b ou 2b) soit mise en contact avec un bloc de référence (7b, 8b ou 9b), disposé parallèlement audit axe (C-C) et
    - provocation d'un glissement de ladite bande d'acier précédente ou suivante (1 ou 2) par rapport audit mandrin électromagnétique (7a, 8a ou 9a), tout en ajustant une force d'attraction magnétique dudit mandrin électromagnétique (7a, 8a ou 9a) grâce à un réglage du courant devant le traverser, de manière à obtenir un alignement latéral de ladite bordure latérale (1b ou 2b) de ladite bande d'acier précédente ou suivante (1 ou 2).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que ladite bande d'acier précédente ou suivante (1 ou 2) présente une épaisseur comprise dans la plage allant de 0,05 mm à 1,0 mm.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite bande d'acier précédente ou suivante (1 ou 2) est une bande d'acier contenant du silicium.
  5. Procédé de découpage, de mise bout-à-bout et de soudage, au moyen d'un faisceau laser, d'une extrémité arrière (1a) d'une bande d'acier précédente (1) à une extrémité avant (2a) lui faisant face, d'une bande d'acier suivante (2), au cours de l'avancement desdites deux bandes (1 et 2) le long d'une ligne de traitement de bande d'acier, dans lequel lesdites extrémités arrière et avant (1a et 2a) se faisant face desdites deux bandes (1 et 2) sont soumises séquentiellement à un découpage et à leur mise bout-à-bout, de manière à former une ligne de mise bout-à-bout et à un soudage suivant ladite ligne de mise bout-à-bout au moyen d'un faisceau laser, pour obtenir une liaison bout-à-bout entre lesdites extrémités arrière et avant (1a et 2a) se faisant face, ledit appareil comprenant:
    - une table de travail (13) disposée dans une partie de ladite ligne de traitement de bande d'acier et présentant une surface pourvue d'une tige de verso (15) sur une partie de cette dernière,
    - un chalumeau de soudage au laser (6) capable de s'étendre sur ladite table de travail (13), suivant une trajectoire de déplacement de chalumeau (6a) perpendiculaire audit axe (C-C) et également de se déplacer verticalement pour se rapprocher et s'éloigner de ladite tige de verso (15),
    - un dispositif de découpage (5) disposé dans une position située à l'avant de ladite table de travail (13) de ladite ligne de traitement de bande d'acier, ledit dispositif de découpage (5) servant à découper lesdites extrémités arrière et avant (1a et 2a) se faisant face desdites deux bandes (1 et 2), suivant une ligne sensiblement perpendiculaire audit axe (C-C),
    - un dispositif d'amenée (3 et 4) disposé dans une position située à l'avant dudit dispositif de découpage (5) et à l'avant de ladite ligne de traitement de bande d'acier, ledit dispositif d'amenée servant à avancer respectivement lesdites deux bandes (1 et 2),
       caractérisé en ce que ladite table de travail (13) peut être déplacée le long de l'axe (C-C) de ladite ligne de traitement de bande d'acier et en ce que l'appareil comprend, en outre:
    - une table rotative (20) servant à supporter ladite table de travail (13), ladite table rotative (20) pouvant être entraînée en rotation autour d'un pivot (21) de cette dernière, ce pivot étant inclus dans ladite trajectoire de déplacement de chalumeau (6a),
    - au moins un mandrin électromagnétique (19) prévu dans une position contiguë à ladite trajectoire de déplacement de chalumeau (6a) et servant à aimanter et à maintenir ladite extrémité arrière (1a) de ladite bande précédente (1) et
    - des moyens de levée (45) prévus dans une position située à l'avant de ladite table de travail (13), lesdits moyens de levée (45) servant à lever et à tourner ladite extrémité avant (2a) de ladite bande suivante (2), dans une direction orientée vers le bas et oblique par rapport à ladite extrémité arrière (1a) de ladite bande précédente (1).
  6. Appareil de découpage, de mise bout-à-bout et de soudage, au moyen d'un faisceau laser, d'une extrémité arrière (1a) d'une bande d'acier précédente (1) à une extrémité avant (2a) d'une bande d'acier suivante (2), au cours de l'avancement desdites deux bandes (1 et 2) le long d'une ligne de traitement de bande d'acier, dans lequel lesdites extrémités arrière et avant (1a et 2a) se faisant face desdites deux bandes (1 et 2) sont soumises, séquentiellement, à un découpage et à leur mise bout-à-bout, de manière à former une ligne de mise bout-à-bout, et à un soudage, suivant ladite ligne de mise bout-à-bout, au moyen d'un faisceau laser, pour obtenir une liaison bout-à-bout entre lesdites extrémités arrière et avant (1a et 2a) se faisant face, ledit appareil comprenant:
    - une table de travail (13) disposée dans une partie de ladite ligne de traitement de bande d'acier et présentant une surface pourvue d'une tige de verso (15) sur une partie de cette dernière,
    - un chalumeau à laser (6) capable de se déplacer sur ladite table de travail (13), suivant une trajectoire de déplacement de chalumeau (6a) perpendiculaire audit axe (C-C) et également de se déplacer verticalement pour se rapprocher et s'éloigner de ladite tige de verso (15),
    - un dispositif d'amenée (3 et 4) disposé dans une position située à l'avant dudit chalumeau de soudage/découpage au laser (6) et à l'avant de ladite ligne de traitement de bande d'acier, ledit dispositif d'amenée (3 et 4) servant à avancer lesdites bandes (1 et 2),
       caractérisé en ce que ladite table de travail (13) peut être déplacée le long de l'axe (C-C) de ladite ligne de traitement de bande d'acier, ledit chalumeau (6) sert à découper et à souder simultanément lesdites extrémités arrière et avant (1a et 2a) au moyen d'un faisceau laser,
       et en ce que l'appareil comprend, en outre:
    - une table rotative (20) servant à supporter ladite table de travail (13), ladite table rotative (20) pouvant être entraînée en rotation autour d'un pivot (21) de cette dernière, ce pivot étant inclus dans ladite trajectoire de déplacement de chalumeau (6a),
    - une gorge de séparation de matériau en fusion (46) prévue sur ladite table de travail (13), de manière adjacente à ladite tige de verso (15),
    - au moins un mandrin électromagnétique (19) prévu dans une position contiguë à ladite trajectoire de déplacement de chalumeau (6a), ledit mandrin électromagnétique (19) servant à aimanter et à maintenir ladite extrémité arrière (1a) de ladite bande précédente (1) et
    - des moyens de levée (45) prévus dans une position située à l'avant de ladite table de travail (13), lesdits moyens de levée (45) servant à lever et à tourner ladite extrémité avant (2a) de ladite bande suivante (2), dans une direction orientée vers le bas et oblique par rapport à ladite extrémité arrière (1a) de ladite bande précédente (1).
  7. Appareil selon la revendication 5 ou 6, caractérisé en ce que ledit appareil comprend au moins deux moyens d'agrandissement optiques (37 et 38) pouvant se déplacer en va-et-vient sur ladite table de travail (13), suivant une ligne perpendiculaire audit axe (C-C) de ladite ligne de traitement de bande d'acier.
EP87901655A 1986-02-28 1987-02-26 Procede et dispositif pour couper et souder des courroies d'acier Expired - Lifetime EP0258454B1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP43189/86 1986-02-28
JP4318986 1986-02-28
JP61054406A JPS62212086A (ja) 1986-03-11 1986-03-11 鋼帯端部突合せ溶接時の突合せ方法ならびにその装置
JP54406/86 1986-03-11
JP61311111A JPS63165087A (ja) 1986-12-25 1986-12-25 レ−ザ溶断溶接装置
JP311111/86 1986-12-25
JP62029177A JPS62275591A (ja) 1986-02-28 1987-02-09 レーザ溶接における鋼帯側縁のそろえ方法ならびにその装置
JP29177/87 1987-02-09

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EP0258454A1 EP0258454A1 (fr) 1988-03-09
EP0258454A4 EP0258454A4 (fr) 1988-12-28
EP0258454B1 true EP0258454B1 (fr) 1993-04-21

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EP (1) EP0258454B1 (fr)
DE (1) DE3785523T2 (fr)
WO (1) WO1987005244A1 (fr)

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US4840303A (en) 1989-06-20
WO1987005244A1 (fr) 1987-09-11
EP0258454A1 (fr) 1988-03-09
DE3785523D1 (de) 1993-05-27
EP0258454A4 (fr) 1988-12-28
DE3785523T2 (de) 1993-08-05

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